2.+-

2.+- is a variation of Deadfish, marked a divergent naming of the commands, as well as the contingency for defining aliases for characters.

Commands

It has the following commands:

Command	Result	Deadfish equivalent	Notes
2	Square the accumulator	s
.	Print the accumulator as a character	o	2.+- prints the character associated with the accumulator as its code, whereas Deadfish outputs the accumulator in its verbatim numeric form.
+	Increment the accumulator	i
-	Decrement the accumulator	d
=	Create an alias for another command	None

Examples

An approximate Deadfish implementation can be realized by the alias command =. Please note that 2.+- diverges from Deadfish by printing the character associated with the accumulator, not the numeric value itself.

s=2
o=.
i=+
d=-
Then, you can insert any Deadfish code here.

Hello world using the Deadfish interpreter

The following program emulates a Deadfish “Hello, World!” program by utilizing the alias definition, producing “Hello world”:

s=2o=.i=+d=-iisiiiisiiiiiiiioiiiiiiiiiiiiiiiiiiiiiiiiiiiiioiiiiiiiooiiiodddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddodddddddddddddddddddddsddoddddddddoiiioddddddoddddddddo

Hello world

This program prints “Hello world” utilizing the instruction set inherent to 2.+-:

++2++++2++++++++.+++++++++++++++++++++++++++++.+++++++..+++.-------------------------------------------------------------------------------.---------------------2--.--------.+++.------.--------.

Interpreter

• Common Lisp implementation of the 2.+- programming language.